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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ebea0e1b36bf8234bb285620b61702295d5641c7d31bcf56b49378eeedd1dc3' 
  AND token = 'BUS4xcroyG4NrdW4lzg5mah6+/1+5SnanBd5/vXHWvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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