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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee5d26c7ea59f7e86f04a0ed43a59fd8dea4ac4026cdfc07f669d31deeda7145' 
  AND token = 'jYjDkuddOhNIXSloITTYmp6nm+rlRn2RfhPS6caaF/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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