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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cfdee0d1d7057668aa04a970216f7095734da8656de3cc35f9130620f4ed6f2' 
  AND token = 'orCMrFJ/0T2/8wg2mMQfjfgfujwIKkrgK12ck6F8GNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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