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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '792aca622cee4468d4c2e765b0b87f4554a5eec486fddf56b944482b5c9468a5' 
  AND token = 'G3MCE1LrK80paid2Ez1eYCp896pjo13jonxCMiF6WEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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