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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71e95715b7f704cc3dc8c2515dc1bb3b1d960ae79e725d5f15fc796cdf0da246' 
  AND token = 'xn6+3c0K2O8Xj+3w3l+2U6WUrmGfyOl98LAyU9U2CjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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