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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e6736ece229455c07d19e1dea156077d473960e9c85c10de5217fb492410f30' 
  AND token = 'dv5i3SYDx4TqaI13Rhe+GRZAPA92OWrnprhzF3Llbe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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