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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4241a065c2c1614758b16b0f5e11332c8933e735c435df4dd5a6ec9a1506866b' 
  AND token = 'TvZF1OT9kUfKig9QBQ54jGp7Okl446AlE6wBresQj/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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