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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd77173ab04f3c640e3de15b3fddf5be0cafea3a90c84a7000c37c591ac69eff0' 
  AND token = 'gjXD1bU8HFuBNUUbplp4PopFvUOqX0hYN3ND5CCtd38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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