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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66857ed9b1fd9b981bc2a0e1687a1fb980a78d5b131a564f16ce3f37389f3e48' 
  AND token = '8ZddI86eQhXONONIUGL/WE4FlalsOqICOZ+OLrgAPas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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