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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7f5381aec0710ff5f07259862a7f04aa3878ba4e175f01cb67b1896ce565d9a' 
  AND token = 'CBOWmMzLuq6zJsb5BMQoe3fSX7Y6a3mGoDmFwsroLuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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