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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da5f7dc6ea7937c95b36ff3f316b1d302d4820a849561ff8b05067c6e966e283' 
  AND token = 'lMjM2Lcv0WZ9ttPp8kFmVeHnm3knMxEDIHA3Hz6OWQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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