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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2856c6396846d89473c7b9d8951a961ffccfca4bf11cab5154c4a53c4f039fb2' 
  AND token = 'pbGW6U09V7mXjL/2sGD0AUULnM7qUbrS77IozlTq5A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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