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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34f5ae5874bd743ac9f6b40b605ee719e7a6e8752d2694e2d1cc01d05767aeec' 
  AND token = 'ARxKxlr6iTWBVktSKTxsXJ+auU/DBYJUlNXcl6rJpdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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