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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ac3f477c120a57db429efda4f6cb96d545a353af5881c7ba85fb4035ad58b48' 
  AND token = 'y0MnywgMrRWwlSg0oqxmhpwnijbP3xKI4GcWkWXMzBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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