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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c219408940820308d22ccaf89bdaf240951a279e969d1ba02997740056033b1' 
  AND token = '2sQnrKT/VZ7TTYvmSLeN96Ot0HDdbaGZIZ6RE3TnkYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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