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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73c3eab9984740940ee5d603a9d76815e4d00f44d0dcc305f6f27f23caf7461e' 
  AND token = 'VU9r1vnc3AqtUXm7UJfs7tOjVW9nAeHcIEmTP+s158k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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