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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1133ecdbea3cafebd2b53f4f25a467b4f8c8c170be267bce8a1db30065a8c94d' 
  AND token = 'AIuFkVkLYIicpuvrTJA4bmi93VmlhhREbkgeAWQTTaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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