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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc688bcd21eb9c56ddd28b1d68ad0b5476d2033868c667e0bcaa9ce007d574b7' 
  AND token = 'hpp2dYlDwTy8NR7pp0vmI8N6/gt6EGT0nUkxfgkqWdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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