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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d69a4f176b718262c6bf6504b19eafea67834bb758a05fb05c6754d6aa89d2f' 
  AND token = '7umdOsmedU24cdqVHr0DKVsER2AArwirKKWx0hmVbQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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