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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaf53995218916ab07deff62d77a8fca895f0a24d873da0371db729739d1fa38' 
  AND token = 'CCh/0yA6rLBhI2eP4ECs+zaClYKg/cmImt+tDF5g1sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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