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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71fa962af639b4fc6990b2077f216a987091e70c4d648c009e8b39de69821b7c' 
  AND token = '8MYXPKyJdmYbbUBbzpL5Pov3+ytesoVBO78yLnf2vuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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