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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b71c3058fa1063dc1bce30bb1c0b6666c7dd2f5e3d1aab84f551af662e417fde' 
  AND token = 'pDjoCvSocCchf90RpH76hEzBpQs18TKOD9VNOQ/1S7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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