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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aede7fc5df1dcb429bd63368d02f1b469fa0c390885eb7f1b94f69dc725be864' 
  AND token = 'zZTWaj16mDJl9QW27Qn94RXSseQaCxmao93AuxU8t/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"
  }
}