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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b499d7c5e35595564b753a68ca2a20d631f0d4685fdf7dc4b20a9daa4008e338' 
  AND token = 'zkpPjcSF+Y/g18rXQeUvp+VxloGcNieScF0t6LMQESo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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