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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91c74805e584bf24dca1c7a3008536ec9312b06ad6516f066995b32ac02e12ef' 
  AND token = 'xRl1hiXehstw4siAcY5XOITTSSugVtcbnx7EW9e0FUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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