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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '677555cf0402d87e2a2aafe3d84d10d96d7ef21ab2622d6e01a9dc176202c895' 
  AND token = 'Y4z/1Uh6E9ERaC0nqfUcfoQrVdiJXvyW5qB7t1Fvaw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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