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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d31dc9e4442375165e54fcd5d31a06bff5eaf02185a87510cc4f04b7d462505' 
  AND token = 'Iq/6CAbbrKkvB9bk50Jtz5WPA2pRzpgESgQ0DJINciQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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