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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecfe40930d91f7aa5657289e7f79be24b9ee8c3ed50e8fdd5ca4959546781d6b' 
  AND token = 'YQwxnr0Txuw15aR2NBbqpqDnd+2CTfnZJ9L5Yx4NJqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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