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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5f23947114f8d2b0a41509e7cc44d65492f89b06f4072264f3bd927e2965b18' 
  AND token = 'Flq2siWW8EfAqaLiakOPfklQDIwu7Ss+LjDIo01i2yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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