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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e741c071b826d8bfacaf1f7aa2fcbb68084c9e68f0c568440905f5d540bd26b' 
  AND token = 'X0KonZ+BymYrlL/enkv9Q5D+P6NNXFngQDBdAkAxASA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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