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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb0971956171742e64ceda22b0219918fc5666be20f2880a2451dcd407607b8d' 
  AND token = 'fmblsY/nrP3dMAEojsNJND0nKtr+ctj6d6E4n0VTdV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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