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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c09bdbfdf4d255db326ae7b14cf185e9d1846f7b5ab1d2fbaf36fc8eb99824b' 
  AND token = 'Vv4NUAskU7ngyjnWvTgKei/iDU2aJRZx4W2j2K2RWh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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