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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbc7aa483f00cc3298fe2844dd9e4448c7c16e29fc4c025b705471accdd8453c' 
  AND token = '4PQJKS1qE00t2opzlbH3GUQ3OR+DD80ljCOKxKVuzus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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