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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2c4116c481d8502d2b74aa72c64c82148c27856fc275540998450f99558ea0c' 
  AND token = 'jKrg2KM+Y8SQmA40/ZoOQEABUmsMStXWBfdmDgxld5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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