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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '787795d7d54155d13dfae3956a0f52c4ca33c0d26b8f8cd35bd74e61e0810711' 
  AND token = '7baKcl0RlJw2Xe2yAwHuexUPi+X+AsLe1sZ4Q2USWQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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