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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ef0ec5ef0dfcd648fa93f06184a55faba724b09085437812a456c9f1e5c5766' 
  AND token = 'I0ne3h/zDRWMZ96UJisoXZQ5A68qjAEomNEj8IdPrIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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