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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e95349e143aab39cc7eaa18ccaf5cbe82c55e0e09ec6c6a95f33160d8090edec' 
  AND token = 'WCRtzyQRTBiGEqUFZ4F52/a0lvovnS+riw5y1jmYjaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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