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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46b4555781ac2f094a0ebb4f012c7d9a6188973a30c12c077046eed3aa46329c' 
  AND token = 'FRWr54y5CMCufdyKqN6Pr+ksv6T0on63BTPXmX8bnqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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