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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e20e1d2b220d04f3614241403a29147f9649c54ef58ff882236e30e866eab076' 
  AND token = 'tpbJuQDJ84TphQkaSvXEvf0YycahT72pWnoV5JteVI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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