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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9078a62a559ccdac75bb37c68ab73bd8317584654efa7b5eeb8dba5df6cef046' 
  AND token = 'Vte4GIjTBa17msqL0juNeFj8+735Kirsn/tmjM7nD+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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