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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79b388793969f9fc05751e2c6de4b7b7e54539d0fff9410a75bea877514647b6' 
  AND token = 'MwxAxXaICU58EigEBI7Y2GAp5HWlr3tE1xcLtilM32A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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