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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '384f101c7e44771c2a644357953985be405e049d9b43cdf3ce1eaae528cfacd9' 
  AND token = 'k1tlHBcoVbCKmU2Gi9O3pI9Uwr4t9YnZGMGIOzr5kl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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