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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf74e1e580d98949d0766f502f5500d76fc63b290e58f2b6ece3b1f06c169333' 
  AND token = 'yU7YSlDGj2LMguklrGD+6tog1ATAzCjOnrVlO5d7e4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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