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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0008281039aaba8b3a3eb855520acbeebdfc78e7367fe2c65ee96cde8008cafe' 
  AND token = 'Vv2hHND2GxguGda2b2Uchx6MLwOWdRdK/VGlxplCnnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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