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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7017fa6c7ccae0ce74924e314ef98edab0d2c9608946c21090034b9daed7f32c' 
  AND token = 'GiZvGIP+eFg38boyAv8WL2NfmR1XWdMdZaIowPNrr8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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