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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48b56350c5a59390e5d3bb65e2b4da06af64d61481bfd7e312e2e86bd5549d43' 
  AND token = 'hcbT+hnIsavzG4jQSMu7OqoePLnKQUnN2syLRNCrVAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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