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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10527be9ed02ddbb44758b2094f844fbe5c60913c1f6c2f43f21ff3f5ba1a499' 
  AND token = 'lktIKhMfXhy/aQs/bTRwfpHP7wffVzqSnpXM936M1kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}