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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc88574d9267763665a86f0072b8656f3535e6d475f96cd0b3a81e29698ff96a' 
  AND token = 'c5AoPgmLuSIPxvy5m1FsLkz4D7t6U6aA5c7RmwMzCcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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