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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e429b00b6ebf38c1110533da7d54d2a2e2279b41de6b0c0ae23af7b8377d4e25' 
  AND token = 'T2AA7nrEXZU9oKztQqftl13RMNJbant2w50vasWxzSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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