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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7561ae2534a57f5588c41d98623169e4a4ee1cd2e22a29519f7eb4d1c20f3a9' 
  AND token = 'PnjfPFZX0GNggAqFyniWWo2oNrTICDDCoPVCWOlHkaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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