SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74b55270c5854f321c683c853044df04c8a66d1e4b115af107e70264809ee16c' 
  AND token = 'CpP8VC5q4+tUZFBN9rvKvutnMxwQm+84nBJbLMYXuXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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