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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd614f1d41921703ab1e9490fee20cac6416091a268a1af05dbab9576a4da9454' 
  AND token = 'tmyZfxF1KUoVU/PPPFZOftP10OLne+ACOMSbKEsWW/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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