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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ead1569ee68ef62b8b6c47800519e11fb95a106cc5a0b58ef296774501523af' 
  AND token = 'p67QXU/DrcdNvZZvExRE699GEFpU2e5j5KIQCo4CyXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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