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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6489a6dd741b6de6fb84433b9f2a838422f8717cb0ebebe30699a090e7aa62bc' 
  AND token = 'mCa0ieRM1GwN/Z7g1IjqgROlFU/V6llokGwKUeE81fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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